I might end up stirring the pot here a little bit but in my opinion it depends on how much this mistake is slowing down your overall progress.
Ofcourse, like others have said, it is important to know the difference and words do have different meanings if you don’t extend the vowels or shorten them. But, at the same time, there are so many other things to learn and practice and worry about that if a short/long vowel is genuinely gatekeeping you from learning anything else new, I’d say move on because you will have hundreds of more opportunities to ingrain those vowels into your head through everything else you will end up studying/encountering anyways.
The SRS stage of learning in my opinion is mainly there to equip you with as many little pieces as possible to make your immersion and exposure to native material as efficient and smooth as possible. At some point, that immersion is where you will spend the bulk of your time on and everything will be hammered out and put into place there.
This might be a silly example, but even in the case of something like to vs too, an English learner could become a fluent speaker and reader while still confusing to and too regularly. Also, a native English speaker can still understand someone who accidently writes to instead of too. That’s ofcourse not to say it’s ok to never figure out to vs too, but if someone is genuinely stuck on this for whatever reason and can’t move on to other material, it’s not the end of the world to do so.
I personally feel like getting stuck in the weeds on kanji and vocabulary in isolation and splitting hairs on pronounciation, pitch, every reading, stroke order, and other technical details for months, especially if you have limited time for study, just holds you back from much greater progress in the language.
If you feel like you are genuinely being held back from learning more vocabulary and seeing more kanji because of something like this, I’d say either refresh the web page or use an undo script to just try to correct the mistake again and move on at your own discretion.
Maybe this is all terrible and controversial advice, but it’s also just another way of looking at things and approaching the language learning process.