I'm having the same issue with Arial font. PLEASE provide the solution. This answer is not an answer. While it is great to know why it's happening, it is very frustrating to see that you actually know the cause and provided no solution. 🙂
thanks in advance for your help!
By @lkhemani
a) @Dov Isaacs left the company in 2021, so he won't help you solving the issue.
b) Dov says that it may have two causes for this to happen, and both causes are outside of Adobe's control:
The OS is exchanging/changing fonts from time to time, and the font used to create the file is no more available on the system.
Someone was fumbling around in the file and triggered the problem. Even if it is possible to edit various PDF files, this is not the preferred procedure. Since the document can also be created with a variety of tools, and Adobe does not control them all, there is a high probability that something will go wrong here. Sometimes you know why something could happen, but there is no solution to it. Then you have to go other ways, e.g. change the source file.
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