You should take both. June comes with a built-in and highly plausible addendum statement that:

"Given the LSAT was going to change fundamentally starting in the August tests, I was concerned the value of an LSAT score to Law Schools may change in ways that are unpredictable. Therefore, I rushed to take the last LSAT that Law Schools understand the value of despite not having had as much study time as I would have otherwise liked. After getting a score below what I was hoping for, I took the additional time to study and retest despite the uncertainty surrounding the new LSAT."

No reason to not go for it!