Hi, @ashin, and welcome to our Netlify community site.
Would you please send us a link to the deploy in the Netlify UI?
Without examining the site directly, my best guess is that the issue is similar the ones discussed here:
To summarize the topic above, often issues are caused some background process (making database or GraphQL queries for example) which isn’t exiting so the build never “ends” from the build systems point of view. This causes the build not to complete and it is therefore forcibly cancelled when the time limit is reached. The solution for this it to make certain any workers exit when their work is complete.
If this topic doesn’t help and/or there are other questions, please let us know.