to become dissipated (see DISSIPATE sense 1) or decompose
BREAK UP, DISPERSE
Those seem like pretty accurate descriptions of what happened. Yes, dissolve can also mean something stronger, so perhaps it is fair to call the statement ambiguous. But it isn’t incorrect.
Definitions of dissolve:
to cause to disperse or disappear
to separate into component parts
to become dissipated (see DISSIPATE sense 1) or decompose
BREAK UP, DISPERSE
Those seem like pretty accurate descriptions of what happened. Yes, dissolve can also mean something stronger, so perhaps it is fair to call the statement ambiguous. But it isn’t incorrect.