For example, as it is currently, blood splatter completely overrides and gets rid of electrified water surfaces on which they land. With Ice, this isnt a problem as ice spells simply re-ice the area due to blood being able to create ice. However, this is a particularly troublesome problem when it comes to electrified water as blood cannot be electrified like it can be iced. Making it so that anyone wanting to utilize electric surfaces must again generate water in the area and cast a lightning spell or use other means of generating electricity. Meaning, enemies and players who take any physical damage no longer have to worry about taking extra damage on their turn if they ended up on an electrified surface. unless 2 actions (and possibly two spell slots) are taken to reapply it, unlike ice which can much more easily be recreated and in more scenarios. It also makes using lightning setups around water less interesting and impactful as now any damage that creates blood splatter nullifies it.
This odd override system makes items such as The Watersparkers boots incredibly inconsistent and not work most of the time as taking any damage that creates blood splatter means the wearer will no longer start their turn on an electrified surface and thus not gain any charges.
Also to note, surfaces that require concentration to maintain such as entangle, spike growth, etc, do not get overridden by certain environmental surface creations such as water or blood while fire logically works. However, surfaces like plant growth that do not require concentration get removed by all other surfaces like blood and water, not just things like fire.
As such, I believe that certain environmental surfaces should take precedence over certain other ones no matter which is created last. such as electrified surfaces not being nullified by blood and plant growth not being nullified by blood or water. Because in certain circumstances it makes sense for surfaces to override others. acid over water, water over acid, fire over plant structures, etc. just not others.