Hi Bungie,
Please take a look Destiny 2 Official Extension for Twitch; for recording match reactions it hasn't worked well for a few months but in about the last month and a half it's almost impossible to react to the 10 matches.
I do not think this is a case of trying to react before the 5 minute countdown has run it's course.
In some cases the reaction options do not appear at the end of a match and the only way to bring them back is to refresh the page you can loose progress.
You used to be able spread reactions over a Trials weekend but progress will not be remembered over days unless you get 10 perfect reactions in 10 consecutive matches the counter is not making it to the end or you can see yourself loose progress. There is no need to introduce RNG to this too.
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It's a mess, frankly. I don't even know what the underlying problem might be, but I don't see Bungie fixing it any time soon.