Hello,
Looks that deactivate doesn't work when teoz is enabled:
!pragma teoz true
b -> a ++ #red : hello
deactivate a
b -> b : self
http://www.plantuml.com/plantuml/png/KomeIapFJLGeISslKYWfAatbIbBGjLD8LD3MLb0kIarHi5B8ICt9oUTAIKrCBiaiIon9LKY4g4a2oXMdvgHn0G00

Teoz disable:
http://www.plantuml.com/plantuml/png/SoWkIImgAStDuL9NB2XAJCzDL2X9pQzIA2agJULAKj2rKqXKqDPMK2vAJL6mKiX8pSd9vqf9JKmkoInBB4bLI8IeIGBA5QVcf74vfEQb00q30000

Interestingly, when running plantuml locally with teoz enabled, png seems to be generated correctly (like in first picture) but svg has result like in second picture. Generated svg has source where "deactivate" is correctly generated.
Tested with PlantUML version 1.2021.2, initially noticed with version 1.2021.00
br,
Hannu