@Etonkovidova will take a look into this

Re-checking in betalabs:
(1) Following the steps in the task description - I did not manage to sent multiple WikiLove messages.
(2) Clicking multiple times on the Send button - the duplicate messages were sent (but no more than two).
(3) The error was displayed

(1) Following the steps in the task description - I did not manage to sent multiple WikiLove messages.

I was able to send duplicate messages on Mediawiki.org (structured discussions). Maybe it's specific to Flow?

In T210883#5254125, @kostajh wrote:

(1) Following the steps in the task description - I did not manage to sent multiple WikiLove messages.

I was able to send duplicate messages on Mediawiki.org (structured discussions). Maybe it's specific to Flow?

I checked ukwiki in betalabs where Flow is not installed. Duplicate WikiLove messages can be sent as described in the task and in the steps in my comment.

Hey @Etonkovidova it is unclear when and why this happens in order to enable us to determine the urgency of this task. Can you evaluate when and why this is happening?

I re-checked the issue in betalabs. The issue with sending duplicate WikiLove messages is different on Flow-based User talk pages and wikitext User talk pages. I've update the task description and also will summarize it here:

Flow-based pages - the steps exactly as described in the task description.
wikitext-based pages - duplicates will be sent with double-clicked Send button only. The steps #2-3 may be omitted.

The Growth-Team figured out what the specific issues are here, we are not going to work on it but it is still a good first bug that someone else should work on.