Why is my text turning white on a white search bar in Facebook only on Ipad?

This may be helpful to some people:

• I checked the text colour in the search box on Facebook and found the following results:
  • iPad Air (generation 1) through the Facebook App - White text on white background, text NOT visible.
  • iPad Air Facebook through Google browser - Black text on white background, text visible.
  • Desktop PC Facebook through Google browser - Black text on white background, text visible.
  • Desktop PC Facebook through Microsoft Edge browser - Black text on white background, text visible.

Today 10/07/21 I took the following action to resolve the problem:

• Logged out of Facebook and back into Facebook - This made no difference the text was still white on white.
• Re-booted iPad Air - This made no difference the text was still white on white.
• Again logged out of Facebook and back into Facebook - This made no difference the text was still white on white.
• Updated Facebook App through App Store to version 325.0 259MB - This made no difference the text was still white on white.
• Another update was available in the App Store ONLY after I had installed update 325.0, this new update version 326.0 258.5MB was available from 08/07/21.
• Updated Facebook App through App Store to version 326.0 258.5MB - This corrected the problem and the text has been restored back to black text on a blue background.

Bit long winded I know but I hope this experience helps some people.