Compose key: How do I enable partial compositions?

I have a bunch of unicode symbols defined in .XCompose and a lot of them are sort of like this where the key sequence for some symbols is a prefix of the key sequence for another symbol:
<Multi_key> <E> : "∃"  # latex \exists
<Multi_key> <E> <slash> : "∄" 

This used to all work just fine, but after an update I can no longer type the ∃ symbol and can only type the ∄ symbol because it thinks if I press anything after E that isn't a slash that it was a mistake.

Is there a way to configure the compose key to behave like it previously did? (where ⎄E␣ would enter ∃ then a space instead of assuming the space was a mistake)
Solution
Unix & Linux Stack Exchange
I tried adding this compose key sequence to my ~/.XCompose:
&lt;Multi_key&gt; &lt;L&gt; &lt;L&gt; : &quot;Λ&quot; U039B # GREEK CAPITAL LETTER LAMDA

I then tried to use this in a few places, but the
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