When they said 32-bit support was "deprecated" in Mojave, that simply meant that they did no updates, not that they somehow limited it.Nagging window and feature deprecation in Mojave is a downgraded experience compared to High Sierra, which has none of those issues.
Who knows what Apple disabled quietly in Mojave to nudge more people to abandon their old machine or upgrade to Catalina.
Deprecated in that context merely meant that it was left alone, and soon to be discontinued. Which of course it was in the following MacOS release.
I had absolutely zero additional issues with 32-bit programs in Mojave compared to High Sierra. So if you were having issues between the two, I'd say it was something unrelated that you mistakenly concluded was from the 32-bit support in Mojave.