Tbh its unclear of and how much water there has been.
Possibly some of the salt(?) Water came through.
By breathing a lot of dry air through it, the moisture will be gone. However there can be residuals especially salt.
If I were to dive in cold water conditions I would get it serviced, telling the service about it. Note I am conservative...
In warm water I would be less worried, if it breathes fine. Have seen too many people tossing the whole regs into the cleaning box, so almost every rental regulator will got some water inside. And there are not many if at all incidents regarding this.
However cleaning water does not have salt (well a bit accumulating from the cleaning). However there will probably also be some incidents like that, this gear is not treated well.
Anyway thats a comment for the remainder of the trip. Afterwards I would get it serviced, so just a bit earlier.