Over on the UK Large Format Photography forum https://www.5x4.co.uk/threads/any-ideas-whats-caused-this-problem.1270/#post-10851 Martin Henson posted an image showing extensive mottling. I have had a similar issue on three rolls of 120 FP4+, this is an example. My film is stored in a bedroom in a cool cupboard and I have never had this problem before.

Ilford FP4+ ID11 11 minutes at 20°C
Batch No. 78BFN1C01/03 Expiry date: June 2023
This is the third roll out of a batch of ten I bought from SpeedGraphic on the 25/03/2020, all of which showed this problem. I will be contacting Ilford for their comments.

Ilford FP4+ ID11 11 minutes at 20°C
Batch No. 78BFN1C01/03 Expiry date: June 2023
This is the third roll out of a batch of ten I bought from SpeedGraphic on the 25/03/2020, all of which showed this problem. I will be contacting Ilford for their comments.