Why can't I access any of my 2019 transaction history?

No, you're not alone. I lost a few months of my transaction history. After opening a ticket, it took them over a month to restore it. Rather frustrating because it makes it impossible to tell whether or not you're being charged the correct amount each month.

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Kimberly, did you reach Fizz support? What happened to your 2019 transactions history ?

There is someone on French forum who lost some data from his recent receipts (the receipts are missing detailed charges info).

They did eventually restore my transaction records, but the transactions are missing details they had before, and the monthly plan payment dates are all messed up. For 2019, I now have monthly plan payment dates of 12/10/2018, 12/10/2018, 12/10/2018, 3/13/2019, 4/23/2019, and 4/23/2019. At least it adds up to the correct number of payment dates so far for 2019 (my July payment hasn't been done yet), but someone clearly messed around a lot with my transactions records. It makes it more difficult to trust that Fizz is adequately keeping track of the balance of my referral credits, because the only way for me to see what's left is to add up the transactions and subtract from the referral total, but the transaction records (and likely the referral credits themselves) can apparently be manipulated at will by Fizz.
Edit: My "restored" transaction records have little to no details, like those of David C. My 2018 records have all the details that are now missing on the 2019 ones, even the ones that had those details before my problem was "fixed".

@Mike. I hope so too, but transactions that I wasn't even missing before my complaint have now been altered in my visible transaction records. That's a bit disturbing frankly.