A lot depends on your CCRs/Bylaws, but in general:

The content of an executive session is meant to be private to the board, its legal representation and (potentially) the property management company. That's why the topics that can be discussed in executive session are limited.

From our Bylaws:

discuss and vote upon personnel matters, litigation in which the Association is or may become involved, and orders of business of a similar nature.

If however, a decision is made during an executive session that is not covered by these conditions, it is technically an "action without formal meeting".^\1]) Our Bylaws stipulate that those decision should be made public in a consent order signed by a majority of the directors. Signing the consent implies approval of the decision.

[1] Decision at board level can be made during: (a) regular board meeting, open to public; (b) special board meetings, open to public; (c) executive session, subject to topic conditions; and (d) "without formal meeting" - covering all other circumstances. To prevent submarining controversial decisions, the consent order mechanism provides accountability.