Having reread your question, I now realized that my answer was not correct. I made a fundamental error in my answer by conflating contributions reported on form 5498-SA and distributions reported on 1099-SA. Because of this I incorrectly advised you wait for your form 1099-SA that deals with distribution from an HSA which of course was what you were asking.
It doesn't really mean that your HSA custodian misapplied your 2018 contribution to 2019 as indicated in box 2 on the 5498-SA. This form does not have to be entered directly into TurboTax anyway and TurboTax never asks whether any of the 2019 contribution relates to 2018. To fix this, you will only enter contributions you made for 2019 that relates to 2019 only. You may also have to make adjustments for any employer contribution if one exist.
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