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Strange as it may sound, the connection of fastboot is more picky than adb. Usually an older pc, a usb hub or a Linux OS seems to fix it. I primarily see the issues with Windows pc with an USB3 port. I got the issue on mine too, but even a USB3 port on a thunderbolt docking works. As an old tech guy it oozes of handshaking issues, that is a bug in the driver for Windows means it can not correctly handle if things goes too fast, and an usb2 port or a hub is enough overhead for handshaking to work...

Lineage-22.2-20250922-NIGHTLY-pro1x with September 1st security patch installed smoothly via OTA. MindTheGapps15, and root was maintained.

AFAIK stuff like flex-cables are custom, so highly unlikely to find. Best chance is to find a specimen with another bug and cannibalise it for the needed parts.