Rolling back to 1.3.5 or earlier resolved the issue. All versions 1.3.6 or newer had the corrupted RX when using the Nano IoT as the RX device and Nano v3 as the TX device. Looking to make a report now.
Opened this issue on the repo Nano IoT as RX and Nano v3 as TX, corrupted RX data · Issue #797 · nRF24/RF24 · GitHub