Are versions 3.3.x-3.5.x no longer available in Linux AppImage format?

Hmm, this score contain a number of problems that would have been issues in any release. In particular, there is a -3.0 sp horizontal offset built in to the dynamics text style, so dynamics appear way to the left of the notes they are attached to, And then the hairpin in question has automatic placement disabled, thus allowing it to collide with dynamics positioned in this way. You can see exactly the same happen in 3.3.4 if you simply add a system break somewhere so that hairpin is on a single system instead of split. As for the "detached" text, it is actually attached to measure 370 and then dragged almost 42 sp to the left to appear as if it is in measure 366, but this too breaks if the distance between measures 370 and 366 changes, as happens if the location of the page breaks changes. So again, you can induce the same problem in 3.3.4 by, for instance, placing a break after measure 360.

Anyhow, while the problems are thus really inherent to the score, the reason you see a difference here is that 3.6.2 seems to be able to fit measures per page than 3.3.4 did in a couple of places, thus changing the system break locations. Notice measure 336 is on page 64 in 3.6.2 but 67 in 3.3.4 (well, I don't have that version, I'm actually comparing against 3.4.2). There were a few bug fixes involving things like the amount of space after an initial clef when using the open/atonal key signature - previous version generally added too much. Just a fraction of an inch too much, but on some pages of your score, this was enough to cause older versions to fit fewer measures on the page that it should have.

Page one is one such example right off the bat - look at the very first measure and see the extra space between the clef and time signature in 3.3.4? That was the bug that was fixed. 3.6.2 closes this gap to what it should have been all along. The difference is enough that 3.3.4 can only fit six measure on the page, but 3.6.2 can fit seven. A handful of other pages with a similar discrepancy, and that's how things got off.

In this case, there's a pretty simple solution if you don't feel like fixing all the places where there are inappropriate manual adjustments like the -42 sp offset on the text or the disabled autoplace on hairpins, etc. You could open the score in 3.3.4, run Format / Add/Remove System Breaks, and choose the second option - too add breaks right where they are. This basically locks this layout in, so even though 3.6.2 could fit more measures on some pages, it won't. You end up with measure 366 being right where it was in 3.3.4, and all looks good.

Still, long term, probably worth eventually fixing the core issues there, to make the score less "fragile" - so occasional changes to where the breaks occur don't mess things up. At least those two issue (the disabled autoplace on the hairpin, the bad offset on the "detached" text). You might consider also choosing a more conventional placement for dynamics - directly below notes rather than far enough to the left to invite collisions. If any specific markings need to be adjusted horizontally to avoid the need for extra space between staves or whatever (that's not uncommon), they could be adjusted invidually instead. But, that in itself isn't causing the problem, so that would be optional.