NFC reading inconsistencies across devices

Did anybody encounter issues while doing an NFC tag reading, particularly on the "Pro" devices?

Based on our statistics, almost half of the readings with iPhone 12 Pro failed, due to NFC tag connection issues. Please see below the failure rate:

Top 3 devices:

  1. iPhone 12 Pro with 41,5% failure rate
  2. iPhone 11 Pro Max with 33,3% failure rate
  3. iPhone SE 2nd Gen with 25% failure rate

If we take into consideration the deviation from expected value, see below:

The following types had a higher error value than statistically expected when used significantly:

  1. iPhone 14 Pro
  2. iPhone 12 Pro
  3. iPhone 15 Pro

  The following types, on the other hand, had few to no reading errors with statistically relevant use:

  1. iPhone 14 
  2. iPhone 13
  3. iPhone 13 Pro Max

The essential questions are: 

  1. What are the differences between the iPhone 14 and iPhone 14 Pro in terms of NFC reading functionality? 
  2. What are the differences between the iPhone 11 Pro and iPhone 12 Pro in terms of NFC reading functionality?

See list of device codes: here.