[SOLVED] Incorrect playback when instrument is hidden

SOLUTION: I put the tempo marking on every note in the invisible part.

Hello! I have recently finished a transcription of Vivaldi's RV 319 but have encountered a strange issue: When I upload the transcription to musescore.com, the second-last measure's first tempo change acts much slower than it should. Making the instrument with the most complex lines invisible seems to cause this issue
after making the instrument visible to fix it. (The instrument, an organ, which possesses these fermatas, is invisible because I use it to modify the way the piece sounds or to add Baroque ornamentation).

Here are the factors I suspect may be affecting this measure, though I'm no programmer:
1. Fermatas (for playback)
2. An invisible instrument having played notes
3. Tempi changes (for playback, mimicking improvisation before the final cadence)
4. BSG's phrasing plugin (https://musescore.org/en/node/292789)
5. Instrument changes to mimic organ stops
6. SoundFonts (only SF in synthesizer: https://musescore.com/groups/counterpoint-and-fugue/discuss/5086585)
7. Synthesizer settings
8. Mixer settings

Thank you in advance for helping if possible! I have attached the score in question if anyone thinks taking a look might help. Note that the playback seems correct until you either a) upload the score or b) repeatedly play the measure after rendering the extra organ invisible.