Pre-Snap Communication w/ Players

[FHSUref]

All,
I officiated FB for several years at the High School level. I have since had to leave it because of my current career.

My question to those of you who officiate at the Collegiate level... or any level for that matter is, Prior to the snap, if you are the LJ or the J, do you communicate to the WR or DB is they are lined up on the LOS?

Reason for asking... Watched a game last weekend where the home team was facing a 4th & Goal from the 9yd line down by 4 points with under 40 seconds left in the game. At the snap, the J dropped a flag. The pass thrown by the QB was incomplete thus sending the visitors into celebration.

But wait... the flag. The DB was flagged for being offsides and the Home team scored on the very next play. So, My question....

1. Do you communicate pre-snap to a WR or DB to avoid having to call a penalty in this situation?

Yes? No? Why? Thanks.