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If that bottom vent in the propane compartment is above any possible ignition sources in the bed then it is a concern. However, if it is also where ambient air flow will disperse those vapors then it is less of a concern than if the vent is "contained" within a closed tub.
As a visual because I'm not finding the words to make my thought clear; if the vent is below the lip of an empty backyard pool then it will be a problem. But if that pool is an above ground pool, and part of the side has collapsed, then it is a smaller concern. If your backyard is subject to frequent ~60 MPH winds with that collapsed side then the concern shrinks significantly more.
As a visual because I'm not finding the words to make my thought clear; if the vent is below the lip of an empty backyard pool then it will be a problem. But if that pool is an above ground pool, and part of the side has collapsed, then it is a smaller concern. If your backyard is subject to frequent ~60 MPH winds with that collapsed side then the concern shrinks significantly more.