It might be worth mentioning in Kwiziq's lesson Ya sea/ya fuera... o... to express whether... or... - [number 8284] that verbs [usually?] take the subjunctive when they are governed directly by "ya sea (que)..."
Freeform Writing Exercise C1
I'll add a note to the lesson but bear in mind that the use of the indicative is also possible after ya sea que if what the speaker is conveying is something more factual. I have to agree though in the tendency to use the subjunctive with these phrases.
Gracias y saludos
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