A similar bug still exists in the mainline 5.5.7 kernel:

[106491.771242] iwlwifi 0000:02:00.0: RF_KILL bit toggled to disable radio.
[106491.771247] iwlwifi 0000:02:00.0: reporting RF_KILL (radio disabled)
[106491.771342] wlan0: deauthenticating from e4:aa:5d:e0:e5:60 by local choice (Reason: 3=DEAUTH_LEAVING)
[106491.791040] ------------[ cut here ]------------
[106491.791042] UMAC scan UID 0 status was not cleaned
[106491.791069] WARNING: CPU: 0 PID: 1588 at drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c:1236 __iwl_mvm_mac_stop+0x14f/0x160 [iwlmvm]
[106491.791069] Modules linked in: ccm iwlmvm mac80211 libarc4 iwlwifi rfcomm bnep btusb btrtl btbcm btintel bluetooth ecdh_generic ecc uas usb_storage xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp ip6table_mangle ip6table_nat iptable_mangle iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip6table_filter ip6_tables iptable_filter bpfilter bridge stp llc overlay binfmt_misc snd_hda_codec_hdmi nls_iso8859_1 snd_hda_codec_realtek snd_hda_codec_generic joydev mei_hdcp intel_rapl_msr dell_rbtn x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_rawmidi snd_seq snd_seq_device snd_timer dell_laptop ledtrig_audio dell_smm_hwmon uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common i915 videodev aesni_intel crypto_simd mc cryptd input_leds glue_helper serio_raw dell_wmi hid_multitouch
[106491.791094]  intel_wmi_thunderbolt cfg80211 intel_cstate dell_smbios intel_rapl_perf dcdbas drm_kms_helper dell_wmi_descriptor wmi_bmof snd drm mei_me processor_thermal_device i2c_algo_bit fb_sys_fops ucsi_acpi intel_rapl_common syscopyarea soundcore sysfillrect intel_xhci_usb_role_switch typec_ucsi mei sysimgblt intel_soc_dts_iosf roles intel_pch_thermal typec int3400_thermal mac_hid acpi_thermal_rel intel_hid dell_smo8800 acpi_pad int3403_thermal sparse_keymap int340x_thermal_zone sch_fq_codel nf_tables nfnetlink kvm_intel kvm parport_pc ppdev lp parport ip_tables x_tables autofs4 btrfs blake2b_generic xor zstd_compress raid6_pq libcrc32c usbhid hid_generic rtsx_pci_sdmmc nvme e1000e i2c_i801 ahci nvme_core rtsx_pci intel_lpss_pci libahci intel_lpss idma64 virt_dma wmi i2c_hid hid video [last unloaded: iwlwifi]
[106491.791119] CPU: 0 PID: 1588 Comm: NetworkManager Not tainted 5.5.7-050507-generic #202002281805
[106491.791120] Hardware name: Dell Inc. Latitude 5590/0VYDFF, BIOS 1.11.1 09/19/2019
[106491.791126] RIP: 0010:__iwl_mvm_mac_stop+0x14f/0x160 [iwlmvm]
[106491.791128] Code: 71 04 00 00 74 0e 42 c7 84 a3 0c 18 00 00 00 00 00 00 eb be 44 89 e6 48 c7 c7 f8 a7 48 c1 c6 05 57 71 04 00 01 e8 86 5a a5 df <0f> 0b eb d8 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 0f 1f 44 00 00
[106491.791129] RSP: 0018:ffffadc28161fc20 EFLAGS: 00010282
[106491.791130] RAX: 0000000000000000 RBX: ffff8f3255719e88 RCX: 0000000000000007
[106491.791131] RDX: 0000000000000007 RSI: 0000000000000092 RDI: ffff8f325e419c80
[106491.791131] RBP: ffffadc28161fc38 R08: 0000000000000d35 R09: 0000000000000004
[106491.791132] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[106491.791133] R13: ffff8f325571ad08 R14: ffff8f3255719e88 R15: ffff8f3255718fe0
[106491.791134] FS:  00007ffa630b2bc0(0000) GS:ffff8f325e400000(0000) knlGS:0000000000000000
[106491.791135] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[106491.791136] CR2: 000055de033475a8 CR3: 00000001c7078003 CR4: 00000000003606f0
[106491.791137] Call Trace:
[106491.791144]  iwl_mvm_mac_stop+0xbb/0xe0 [iwlmvm]
[106491.791160]  drv_stop+0x39/0x110 [mac80211]
[106491.791177]  ieee80211_stop_device+0x46/0x50 [mac80211]
[106491.791190]  ieee80211_do_stop+0x58e/0x830 [mac80211]
[106491.791202]  ieee80211_stop+0x1a/0x20 [mac80211]
[106491.791205]  __dev_close_many+0xa2/0x110
[106491.791207]  dev_close_many+0x85/0x130
[106491.791209]  dev_close.part.0+0x44/0x70
[106491.791211]  dev_close+0x18/0x20
[106491.791225]  cfg80211_shutdown_all_interfaces+0x77/0xd0 [cfg80211]
[106491.791233]  cfg80211_rfkill_set_block+0x26/0x30 [cfg80211]
[106491.791235]  rfkill_set_block+0x9b/0x150
[106491.791237]  rfkill_fop_write+0x136/0x1e0
[106491.791240]  __vfs_write+0x1b/0x40
[106491.791241]  vfs_write+0xb9/0x1a0
[106491.791243]  ksys_write+0xb1/0xe0
[106491.791245]  __x64_sys_write+0x1a/0x20
[106491.791247]  do_syscall_64+0x57/0x1b0
[106491.791250]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[106491.791251] RIP: 0033:0x7ffa646eb27f
[106491.791253] Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 19 fd ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 2d 44 89 c7 48 89 44 24 08 e8 4c fd ff ff 48
[106491.791254] RSP: 002b:00007fff183ea710 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
[106491.791255] RAX: ffffffffffffffda RBX: 000055dcc05fdf85 RCX: 00007ffa646eb27f
[106491.791255] RDX: 0000000000000008 RSI: 00007fff183ea748 RDI: 0000000000000018
[106491.791256] RBP: 0000000000000018 R08: 0000000000000000 R09: 0000000000000001
[106491.791257] R10: 0000000000000000 R11: 0000000000000293 R12: 000055dcc0f34070
[106491.791257] R13: 0000000000000000 R14: 0000000000000000 R15: 000055dcc0f29c30
[106491.791260] ---[ end trace fbf6b9f69ff9e6f1 ]---