The room description generated when entering a room starts from the Report an actor going...
rule, which begins:
Report an actor going (this is the describe room gone into rule):
if the player is the actor:
if the action is not silent:
produce a room description with going spacing conventions;
...
Assuming you have no After going...
rules terminating the action before it reaches Report stage, the above code will always run after a going action is carried out. It’s unlikely that you’ve made the going action silent, so this rule should produce a room description with going spacing conventions;
produce a room description with going spacing conventions;
plunges straight into I6 code which, after a number of preliminaries, calls (via I6) the Check, Carry out, After and Report rules of the Looking action to produce the room description. (the Standard Rules are incorrect here in saying that a partial Looking action called by a Going action in this way is not subject to After stage rules, although Before and Instead stages are skipped)
Out of the box, the Check looking and After looking rulebooks are empty and Report looking rules only apply to actors who are not the player.
So, the room description is produced solely by a very complicated cascade of Carry out looking rules, but unless you code something complicated to make these behave differently after a going action rather than a ‘look’ command, what’s printed should be the same whether it’s automatically generated by going or in response to a ‘look’ command.
If you’re getting the name of the new location in bold after going, you know that you’ve at least reached the ‘Carry out looking’ stage of the process. If not, something has probably interrupted things way back in After or Report stages of Going action processing, perhaps by delisting or replacing the ‘describe room gone into rule’ or writing an action-terminating After going rule?
If you’re getting the name of the location in bold but nothing else at all, the most likely reason is that you’ve somehow set to abbreviated room descriptions…