Thank you for posting this. I have to renew next year and plan to do it on-line. Hopefully there won't be a problem. But if there is at least I'm for warned. 
If your license does not have the star, remember:
...Beginning October 1, 2020, only state-issued driver licenses and identification cards that are fully compliant with the REAL ID Act will be accepted for official federal government purposes, such as entering secure federal buildings or
boarding domestic flights. Texas began issuing REAL ID compliant cards on October 10, 2016, and these cards are marked with a gold circle with an inset star located in the upper right-hand corner, as seen in the examples below.
All Texas driver licenses and identification cards, both compliant (star) and non-compliant (no star) are valid until the expiration date shown on the card. If you replaced or renewed your card after October 10, 2016, and have a gold star in the right-hand corner, your card is REAL ID compliant and no further action is required on your part. You may continue to use your compliant card for federal identification purposes until it expires.
If your card does not have the star, you can continue to use the card after October 1, 2020, but it will only be accepted for state-related purposes such as driving (driver license only), banking, and voting. It will not be accepted as identification for federal purposes....