In some places, we check if the amount we read is a multiple of some amount we are interested in. However, ReadFromOffset returns -1 when it errors. Certain record sizes can cause ReadFromOffset to cause us to think that we succeeded when we did not.

It also results in confusing messages in logs.

PiperOrigin-RevId: 461798762
Change-Id: I8c9c7f2cea4d1789e95e50833d5405239a47f02e