Instead of symbols there are just squares. This happens after adding fabric api to the folder. Please fix for 1.20.1

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There is a common issue where Optifine causes this, please try without optifine or reach out for support in one of the places detailed above.

It’s quite possible, I don’t rule out the fact that the problem may be in Optifine, but I installed fabric-api-0.83.1+1.20.1 and it helped me