Comment # 14 on bug 1187472 from Peter Aufner

I've made further progress:

I've found the 2 firmwae files for bluetooth in /lib/firmware and extracted
them.
This refers to:
qca/htbtfw20.tlv.xz
qca/htnv20.bin.xz

Now bluetooth is working on the kernels 5.10.16 from home:tiwai:kernel:5.10 and
5.12.10 from the main Tumbleweed repository.

And more importantly, hibernate and resume both work as well on both!

However, now Wi-Fi doesn't come up anymore after resume, while bluetooth still
does.

Even more concerning, after manually trying to rmmod all relevant modules
(ath11k, ath11k_pci, btqca and hci_uart) and modprobing them again after
resume, my Wi-Fi is now gone for good. Even after a complete shutdown and fresh
boot doesn't show up anymore. I've also tried restarting the NetworkManager
service.

TL;DR:
Unpacking the Bluetooth firmware gets hibernate/resume as well as Bluetooth
working but causes troubles with Wi-Fi.