Im not sure your statement is true.
Military Salute offers release date have shifted over time (which doesn't align with passing of the federal budgets). Prior to 2016, the offer was released in August. After 2016, the offer shifted to late September. In 2018, we had a CR from Oct 2018- Jan 2019. The government shutdown for 3 days. The DOD did not have a passed budget for the full FY. We also had another shutdown in 2019 in Dec 2019-Jan 2020. The DOD also did not have a passed budget for the full FY. In both these cases, the DOD only had a CR for part of the year and was able to sign an agreement with Disney.
Universal previously paused their military discounted tickets for 2 years after Harry Potter World opened up. Disney might be doing the same thing with the 50th Celebration. The only reason why they might have allowed discounted tickets for the first part of 50th (Oct - Dec) was because of the uncertainty of park attendance and to allow the use of previous salute tickets. Now that people are traveling more, Disney might not feel like they need to release the military discount until 50th is over.
I am just hoping they announce what they plan to do in the next month.