I came upon a weird situation in an image with regards to tagging, and a quick search of this forum revealed no results I could use to guide my decision. I apologize in advance if such a discussion had already occurred and this is redundant.

https://e621.net/posts/1591377 depicts two characters: a femboy male, Shaze, and a female character who evidently was originally male and has the trans (lore) and trans woman (lore) tags, Phyco. The trans female character is in a few pictures depicting what was stated in the picture descriptions to be permanent MtF transformation, and in the overwhelming majority of the 88 pictures that I could see with my blacklist on, they are a super-voluptuous and busty female.

The picture also has the crossgender and MtF crossgender tags. I determined the reason was the presence of Phyco and the tagger having deemed her a crossgender case whenever she is depicted as female, despite that being her ordinary canonical gender.

My understanding has always been, if a character is depicted as a gender different from what is canonical and ordinary for that character (e.g., uber-trap Astolfo being drawn with DDD tits, or a female character who is female in ~90-95% in the pictures here, Judy Hopps depicted as a femboy or futanari, etc.), the crossgender tag applies. Thus, I was about to remove the MtF crossgender and crossgender tags, but I had second thoughts and decided I should consult the wiki article for crossgender just to be sure.

The article's definition, to my surprise, supports the decision to apply the crossgender tag to all pictures of Phyco, though only one sentence of it addressed the question:

"If it's not the character's original gender, then it's a crossgender."

Phyco's character indeed seems to have been a natal male who had a permanent MtF transformation (as in, transitioned with magical technology and not the way it's done IRL). She meets the aforementioned standard.

My question for the general community is, is this a proper interpretation and definition of crossgender? It contradicts my long-running understanding, conception, and implementation of the tag, and my impression of how communities such as this envision and apply it. However, I haven't even conceived, let alone encountered, this scenario before now. The closest I may have come was wondering momentarily whether and when shapeshifters, and characters who actively and casually alternate between sexes and aren't separate twin characters (I've seen a few fursonas like that).

I feel a consensus should be established- if it hasn't already been- on whether characters with trans lore tags, and characters with histories such as Phyco's whether or not they have such lore tags, meet the definition of crossgender when they are depicted in their post-transformation/transition form, and that form is as prevalent and canonical as Astolfo's femboy male form.

Trans and Cross gender are two different things.
Trans is when the character, lore wise, has decided to transition from one gender to another. (I.E. the character suffers from gender dysphoria)
Cross gender is when a character has been gender swapped for the fun of it. (I.E. drawing Spyro as female because female Spyro)

I checked another character with a similar history, evelyn_(sff), and a minority of the posts (5 of 44) have the crossgender tag as well. In my opinion, crossgender shouldn't apply to these cases. Crossgender characters, by definition, should look differently than their canonical appearance (i.e. depicted as the opposite sex), but these characters are just being depicted as they usually would be canonically.

the case of phyco is a bit weird. I'm not sure we should be tagging the character as trans at all since he's born male and still considers himself male. I don't think that the sex change the character went through was never really given a canon reason, but it wasn't related to him having dysphoria.

looking at the gender lore tags' definitions on their wikis, Phyco should probably tagged as male_(lore) in any of the pictures that show him with a female body, and shouldn't be tagged with trans_(lore) tags at all, probably(?).
and I'm not sure if he should be tagged as crossgender ever, he appears as both male and female intermittently, so his canon gender is both, kinda.

what about posts like post #3040432? the characters are depicted as female, but without any transformation or the like.