Same issue here. As many others here, I need to use the mic at work's meetings and I needed to spent extra money on a wired headset because of this bug made my airpods useless for the task.

elementary OS 5.1.7 Hera, Built on Ubuntu 18.04.4 LTS.
Linux 4.15.0-135-generic.

$pactl list cards
Card #0
	Name: alsa_card.pci-0000_00_1b.0
	Driver: module-alsa-card.c
	Owner Module: 7
	Properties:
		alsa.card = "0"
		alsa.card_name = "HDA Intel"
		alsa.long_card_name = "HDA Intel at 0xf0000000 irq 26"
		alsa.driver_name = "snd_hda_intel"
		device.bus_path = "pci-0000:00:1b.0"
		sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card0"
		device.bus = "pci"
		device.vendor.id = "8086"
		device.vendor.name = "Intel Corporation"
		device.product.id = "27d8"
		device.product.name = "NM10/ICH7 Family High Definition Audio Controller"
		device.form_factor = "internal"
		device.string = "0"
		device.description = "Built-in Audio"
		module-udev-detect.discovered = "1"
		device.icon_name = "audio-card-pci"
	Profiles:
		input:analog-stereo: Analog Stereo Input (sinks: 0, sources: 1, priority: 60, available: no)
		output:analog-stereo: Analog Stereo Output (sinks: 1, sources: 0, priority: 6000, available: yes)
		output:analog-stereo+input:analog-stereo: Analog Stereo Duplex (sinks: 1, sources: 1, priority: 6060, available: yes)
		output:iec958-stereo: Digital Stereo (IEC958) Output (sinks: 1, sources: 0, priority: 5500, available: yes)
		output:iec958-stereo+input:analog-stereo: Digital Stereo (IEC958) Output + Analog Stereo Input (sinks: 1, sources: 1, priority: 5560, available: yes)
		off: Off (sinks: 0, sources: 0, priority: 0, available: yes)
	Active Profile: output:analog-stereo+input:analog-stereo
	Ports:
		analog-input-mic: Microphone (priority: 8700, latency offset: 0 usec, not available)
			Properties:
				device.icon_name = "audio-input-microphone"
			Part of profile(s): input:analog-stereo, output:analog-stereo+input:analog-stereo, output:iec958-stereo+input:analog-stereo
		analog-output-speaker: Speakers (priority: 10000, latency offset: 0 usec)
			Properties:
				device.icon_name = "audio-speakers"
			Part of profile(s): output:analog-stereo, output:analog-stereo+input:analog-stereo
		analog-output-headphones: Headphones (priority: 9000, latency offset: 0 usec, not available)
			Properties:
				device.icon_name = "audio-headphones"
			Part of profile(s): output:analog-stereo, output:analog-stereo+input:analog-stereo
		iec958-stereo-output: Digital Output (S/PDIF) (priority: 0, latency offset: 0 usec)
			Part of profile(s): output:iec958-stereo, output:iec958-stereo+input:analog-stereo

Card #7
	Name: bluez_card.AC_80_1C_01_34_B0
	Driver: module-bluez5-device.c
	Owner Module: 33
	Properties:
		device.description = "Baseus Encok W04 Pro"
		device.string = "AC:80:1C:01:34:B0"
		device.api = "bluez"
		device.class = "sound"
		device.bus = "bluetooth"
		device.form_factor = "headset"
		bluez.path = "/org/bluez/hci0/dev_AC_80_1C_01_34_B0"
		bluez.class = "0x240404"
		bluez.alias = "Baseus Encok W04 Pro"
		device.icon_name = "audio-headset-bluetooth"
		device.intended_roles = "phone"
	Profiles:
		a2dp_sink: High Fidelity Playback (A2DP Sink) (sinks: 1, sources: 0, priority: 40, available: yes)
		headset_head_unit: Headset Head Unit (HSP/HFP) (sinks: 1, sources: 1, priority: 30, available: no)
		off: Off (sinks: 0, sources: 0, priority: 0, available: yes)
	Active Profile: off
	Ports:
		headset-output: Headset (priority: 0, latency offset: 0 usec)
			Part of profile(s): a2dp_sink, headset_head_unit
		headset-input: Headset (priority: 0, latency offset: 0 usec, not available)
			Part of profile(s): headset_head_unit

$ bluetoothctl

[NEW] Controller 00:1A:7D:DA:71:11 siemens-AMILO-Pi-1505 [default]
[NEW] Device AC:80:1C:01:34:B0 Fran Hdez's Airpods
[NEW] Device 4B:A3:18:BC:21:5B Sony Home Sound System
[NEW] Device 2B:20:C2:C6:E1:5D Bose QC25
[NEW] Device B1:81:AE:C5:1D:20 Home Living Room Pioneer Sound System
Agent registered
[Fran Hdez's Airpods]# info AC:80:1C:01:34:B0 
Device AC:80:1C:01:34:B0 (public)
	Name: Baseus Encok W04 Pro
	Alias: Fran Hdez's Airpods
	Class: 0x00240404
	Icon: audio-card
	Paired: yes
	Trusted: yes
	Blocked: no
	Connected: yes
	LegacyPairing: no
	UUID: Audio Sink                (0000110b-0000-1000-8000-00805f9b34fb)
	UUID: A/V Remote Control        (0000110e-0000-1000-8000-00805f9b34fb)
	UUID: Handsfree                 (0000111e-0000-1000-8000-00805f9b34fb)
	UUID: Human Interface Device... (00001124-0000-1000-8000-00805f9b34fb)
	UUID: PnP Information           (00001200-0000-1000-8000-00805f9b34fb)
	Modalias: bluetooth:v05D6p000Ad0240
	ManufacturerData Key: 0x6668
	ManufacturerData Value:
  d3 4c f4 e3 6c 04 a0 1f                          .L..l...