$ lsb_release -rd
Description:    Linux Mint 19.3 Tricia
Release:        19.3

I'm seeing the same thing (wifi doesn't show up at all in network manager), here's the kernel messages upon startup:

[    7.219871] iwlwifi 0000:00:14.3: Collecting data: trigger 15 fired.
[    7.219945] iwlwifi 0000:00:14.3: Start IWL Error Log Dump:
[    7.219947] iwlwifi 0000:00:14.3: Status: 0x00000000, count: 214004015
[    7.219948] iwlwifi 0000:00:14.3: Loaded firmware version: 48.13675109.0
[    7.219949] iwlwifi 0000:00:14.3: 0xBC3AEAAA | ADVANCED_SYSASSERT
[    7.219950] iwlwifi 0000:00:14.3: 0xAF69053C | trm_hw_status0
[    7.219950] iwlwifi 0000:00:14.3: 0x702F61C1 | trm_hw_status1
[    7.219951] iwlwifi 0000:00:14.3: 0xF9D9A858 | branchlink2
[    7.219952] iwlwifi 0000:00:14.3: 0x53C24701 | interruptlink1
[    7.219953] iwlwifi 0000:00:14.3: 0xBFFA68E8 | interruptlink2
[    7.219953] iwlwifi 0000:00:14.3: 0x75927DE3 | data1
[    7.219954] iwlwifi 0000:00:14.3: 0x5F16676E | data2
[    7.219955] iwlwifi 0000:00:14.3: 0xEC529CA5 | data3
[    7.219955] iwlwifi 0000:00:14.3: 0xCB93E476 | beacon time
[    7.219956] iwlwifi 0000:00:14.3: 0x250A3F7C | tsf low
[    7.219957] iwlwifi 0000:00:14.3: 0x819FD8F5 | tsf hi
[    7.219958] iwlwifi 0000:00:14.3: 0x97114000 | time gp1
[    7.219958] iwlwifi 0000:00:14.3: 0xF67E2407 | time gp2
[    7.219959] iwlwifi 0000:00:14.3: 0xA1D07223 | uCode revision type
[    7.219960] iwlwifi 0000:00:14.3: 0xC56401B8 | uCode version major
[    7.219960] iwlwifi 0000:00:14.3: 0x0356C8AE | uCode version minor
[    7.219961] iwlwifi 0000:00:14.3: 0xE99654BE | hw version
[    7.219962] iwlwifi 0000:00:14.3: 0x1975EC66 | board version
[    7.219963] iwlwifi 0000:00:14.3: 0xA913F6AE | hcmd
[    7.219963] iwlwifi 0000:00:14.3: 0x42CB85B3 | isr0
[    7.219964] iwlwifi 0000:00:14.3: 0x7B06F680 | isr1
[    7.219965] iwlwifi 0000:00:14.3: 0x8BDC716C | isr2
[    7.219965] iwlwifi 0000:00:14.3: 0x392C32D8 | isr3
[    7.219966] iwlwifi 0000:00:14.3: 0x37A454B6 | isr4
[    7.219967] iwlwifi 0000:00:14.3: 0xAA9CA074 | last cmd Id
[    7.219967] iwlwifi 0000:00:14.3: 0x404A396E | wait_event
[    7.219968] iwlwifi 0000:00:14.3: 0x6E39E953 | l2p_control
[    7.219969] iwlwifi 0000:00:14.3: 0x640B1701 | l2p_duration
[    7.219969] iwlwifi 0000:00:14.3: 0x62C3EFE3 | l2p_mhvalid
[    7.219970] iwlwifi 0000:00:14.3: 0x6F7B97D3 | l2p_addr_match
[    7.219971] iwlwifi 0000:00:14.3: 0xF2D5BD0F | lmpm_pmg_sel
[    7.219971] iwlwifi 0000:00:14.3: 0x229D5CB6 | timestamp
[    7.219972] iwlwifi 0000:00:14.3: 0xEA6A3390 | flow_handler
[    7.220003] iwlwifi 0000:00:14.3: Start IWL Error Log Dump:
[    7.220004] iwlwifi 0000:00:14.3: Status: 0x00000000, count: 7
[    7.220005] iwlwifi 0000:00:14.3: 0x201013F1 | ADVANCED_SYSASSERT
[    7.220006] iwlwifi 0000:00:14.3: 0x00000000 | umac branchlink1
[    7.220006] iwlwifi 0000:00:14.3: 0xC008CF5C | umac branchlink2
[    7.220007] iwlwifi 0000:00:14.3: 0x00000000 | umac interruptlink1
[    7.220008] iwlwifi 0000:00:14.3: 0x00000000 | umac interruptlink2
[    7.220008] iwlwifi 0000:00:14.3: 0x00000003 | umac data1
[    7.220009] iwlwifi 0000:00:14.3: 0x20000302 | umac data2
[    7.220010] iwlwifi 0000:00:14.3: 0x01300202 | umac data3
[    7.220010] iwlwifi 0000:00:14.3: 0x00000030 | umac major
[    7.220011] iwlwifi 0000:00:14.3: 0x13675109 | umac minor
[    7.220012] iwlwifi 0000:00:14.3: 0x00005CB5 | frame pointer
[    7.220013] iwlwifi 0000:00:14.3: 0xC0887F58 | stack pointer
[    7.220013] iwlwifi 0000:00:14.3: 0x00000000 | last host cmd
[    7.220014] iwlwifi 0000:00:14.3: 0x00000000 | isr status reg
[    7.220029] iwlwifi 0000:00:14.3: Fseq Registers:
[    7.220031] iwlwifi 0000:00:14.3: 0x00000003 | FSEQ_ERROR_CODE
[    7.220033] iwlwifi 0000:00:14.3: 0x00000000 | FSEQ_TOP_INIT_VERSION
[    7.220036] iwlwifi 0000:00:14.3: 0x870EF20B | FSEQ_CNVIO_INIT_VERSION
[    7.220038] iwlwifi 0000:00:14.3: 0x0000A384 | FSEQ_OTP_VERSION
[    7.220040] iwlwifi 0000:00:14.3: 0xABB52FB9 | FSEQ_TOP_CONTENT_VERSION
[    7.220042] iwlwifi 0000:00:14.3: 0x6F3B2B5A | FSEQ_ALIVE_TOKEN
[    7.220045] iwlwifi 0000:00:14.3: 0x99E6F78E | FSEQ_CNVI_ID
[    7.220047] iwlwifi 0000:00:14.3: 0x8CFC18F0 | FSEQ_CNVR_ID
[    7.220049] iwlwifi 0000:00:14.3: 0x20000302 | CNVI_AUX_MISC_CHIP
[    7.220053] iwlwifi 0000:00:14.3: 0x01300202 | CNVR_AUX_MISC_CHIP
[    7.220058] iwlwifi 0000:00:14.3: 0x0000485B | CNVR_SCU_SD_REGS_SD_REG_DIG_DCDC_VTRIM
[    7.220092] iwlwifi 0000:00:14.3: 0xA5A5A5A2 | CNVR_SCU_SD_REGS_SD_REG_ACTIVE_VDIG_MIRROR
[    7.220121] iwlwifi 0000:00:14.3: SecBoot CPU1 Status: 0x5c29, CPU2 Status: 0x3
[    7.220123] iwlwifi 0000:00:14.3: Failed to start RT ucode: -110
[    7.220126] iwlwifi 0000:00:14.3: Firmware not running - cannot dump error
[    7.233551] iwlwifi 0000:00:14.3: Failed to run INIT ucode: -110


Here's what lshw shows:
 
       *-network:0
             description: Network controller
             product: Intel Corporation
             vendor: Intel Corporation
             physical id: 14.3
             bus info: pci@0000:00:14.3
             version: 00
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi pciexpress msix bus_master cap_list
             configuration: driver=iwlwifi latency=0
             resources: irq:16 memory:ea238000-ea23bfff
 
I brought this up over at the Mint forums also: https://forums.linuxmint.com/viewtopic.php?f=53&t=312731&p=1765778#p1765778