Thanks for engaging with this topic.
I've just installed 2.5 RC2 and the autocomplete behaviour is the same as 2.4 which was different from 2.3.
In order to replicate the issue: in the main window simply edit an empty cell. As you type, the autocomplete drop box appears. now press the down key. In 2.3 this last keypress (down arrow) performs a 'save cell, next record, edit cell' sequence. in 2,4 & 2.5 the down key engages the autocomplete drop box.
So imagine you are entering a list of Highest Position values in a long list of singles from Top 40.
the records would appear thus:
Title Artist Album Year HP Weeks
Juniors Farm Wings Hit Parade 1975
Only You Ringo S single 1975
So you are editing 1st record - HP and you enter '0' the drop box appears and 01 02 03 04 05 06 07 08 09 are available. then you key 9 (making the entry 09) and the drop box has shrunk to 09.
The next key is the critical one.
In 2.3 the down key will save and move down to the next record with an open edit in HP and the 09 having been saved in the previous record.
In version 2.4 & 2.5 the down key event engages the drop box focus instead of the 2.3 behaviour of: save; next; edit.
So in 2.3 you would edit HP cell and type 09, down, 07, down, 23, down....
In 2.5 the same outcome requires 09, enter, mouse slow double click on next record, 07, enter, mouse slow duble click on next record, 23, and so on.
Hope that makes sense. Certainly my solution is to use version 2.3 for my Top 40 chart data entry and later version for general activity.
BTW Music Bee is awsome and I really don't want this tiny issue to be taken as a critisism in anyway. Also note that not too many people are engaging with this topic or experiencing this as an issue, But I thought I'd try to expain it anyway.