I wouldn't worry about it too much; the propellant is usually just a saturated liquid/gas mixture. It evaporates in lower pressure so after it has come out of the can, the propellant has completely turned into a gas. The propellant propane is water soluble, which means it will not mix with the oil. The other propellant, isobutane, might be oil soluble (it simply said it wasn't soluble in water) however it's boiling point is well below freezing, which means there will be pretty much zero in the oil. If there were gases in the oil, they would quickly be expelled by the oil droplet :)
Both are safe, especially in such small amounts. From OSHA, for isobutane:
Notes: 1) OSHA does not have a PEL for isobutane, which is affirmed as "generally recognized as safe" as a direct human food ingredient (21 CFR 184.1165). No toxic effects reported below 18,000 ppm. 2) Gas/air mixtures are explosive. 3) Metabolized in the body to tert-butyl alcohol."
Long story short: nothing to worry about.