Filter button grayed out when filters exist

Today I've found that the filter button isn't working when opening a saved sheet that already has a filter applied. I've opened a few saved sheets and they all have the same issue which you can see in the image below. Even though you can see that the column 'Today (filter)' has a filter applied to it, the filter icon is grayed out.
Even creating a new sheet and applying a filter to it also has the same problem.
Is there a way to resolve this issue or is it a back-end problem?
Answers
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Hi @BuckyKat
Can you try it from a different browser / private browser and keep us posted.
Thank you very much and have a great one!
Warm regards
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It works correctly in Chrome 122.0.6261.128. It's Firefox, 123.0.1, that's having an issue.
I checked it this morning and the filter button was working again until I refreshed the browser window then the filter button returned to being gray.