こんなの見つけました。
Questions about your T4A? Here’s what you need to know
https://www.canada.ca/en/revenue-agency/news/newsroom/tax-tips/tax-tips-2021/questions-about-your-t4a-what-you-need-know.html
Should you file your 2020 income tax and benefit return if you are waiting for the CRA to resolve an issue with the T4A you received?
Yes. The CRA encourages everyone to file by the deadline. This will ensure there are no interruptions to benefit or credit payments, and helps taxpayers avoid late-filing penalties.
Individuals can use information they have on hand to estimate the income they received, and any income tax withheld from COVID-19 emergency and recovery benefit payments, and file using that information. If needed, the CRA will reassess these returns after the T4A is corrected and an amended or canceled T4A is issued.
T4AまたはT4Eにある金額では無く、
正しい金額で申告して、と書いてありますね。