"END" command placement

[DaleMac]

Apparently OSX doesn't like it when I place the END command on the 1st beat of the last measure of a Coda. It usually just disappears when I re-open the editor, or alter any chord changes. Is this intentional, or just a glitch?

P.S. ....

Might as well use this opportunity to make a related suggestion. The majority of standard tags end on some beat other than 1. Here's an example of what it takes to make one of these iconic endings "play right":

Fly Me To The Moon (with Coda)

It would save some editing time (and eliminate visually awkward codas) if a song could stop on the specific beat where the command is placed. And ideally, though less critical, the program might distinguish between staccato and sostenuto by inserting the corresponding symbol.