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I also have one of these and a stack of 4k discs that won't play. I didn't realise this might be an option until I arrived here. Drive info:

Drive Information
Manufacturer: PIONEER
Product: BD-RW BDR-XD05
Revision: 3.10
Serial number:
Firmware date: 2017-06-22
Bus encryption flags: 1B
Highest ...

I also have one of these and a stack of 4k discs that won't play. I didn't realise this might be an option until I arrived here. Drive info:

Drive Information
Manufacturer: PIONEER
Product: BD-RW BDR-XD05
Revision: 3.10
Serial number:
Firmware date: 2017-06-22
Bus encryption flags: 1B
Highest AACS ...