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Thanks for the report.
Could you post an example ?
The following one is working for us:
@startuml :<latex>\tiny{1 * 2}</latex>; @enduml
http://www.plantuml.com/plantuml/uml/SoWkIImgAStDuRAooKaiIQsmYod9pAkiDbJGKZ2gjT67Y5bpEQJcfG1L0G00
Here are some tests, but I don't know where is the issue...
@startuml :test of ""tiny"" latex; if (some error?) then (without error) #palegreen:<latex>\tiny{1 * 2}</latex>; #palegreen:<latex>\to \tiny{1 * 2}</latex>; else (with first tag on error) #pink:the t of tiny is transformed on tab!; #pink:<latex>\error \tiny{1 * 2}</latex>; #pink:<latex>\wrong \tiny{1 * 2}</latex>; :Error on JLaTeXMath or on PlantUML???; endif @enduml