vLookup got stuck for chosing values

Hi there,
I have a vLookup column I can choose values from.
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There is a possibility to choose from and hit Enter
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The, it's added to the data table.


But sometimes, when I make mistake and delete some characters/numbers and want to repair my input:
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It won't let me to choose any value - it seems to get stuck.
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Looks like this and I cannot choose anything until I refresh the page.

I have to say, that the data source list has about 52 000 items. I got them indexed and it works fine, until I make mistake in the input.
Can you help me out with this issue?
Developer console does not show anything.
Thank you so much.
Steo

Dear @Stepan,
First of all, make sure you use the latest version of the app (v1.8.7) - Update Plumsail Forms On-Premises solution — SharePoint forms

Can you record a video, so I can showcase it to our dev team? Not something we've experienced, we'll need to find a way to reproduce it in order to fix it. We might also need access to the environment, maybe a screenshare session, only if the problem can be reproduced reliably.

Dear @Nikita_Kurguzov , I have recorded a video, where can I share it? I do not want it to be public.
Thank you.
Steo

Dear @Stepan,
Send it to us at [email protected]

Dear @Nikita_Kurguzov ,
sent .mkv video as the attachments attached to email.