Most likely done because:

1. Biden wants to tie official aid to the zionist occupation to a bill funding the fascist regime in Ukraine which Republicans refuse

2. Biden is such a deranged zionist he wants to take sole credit and cut out congress and the Republicans and use it as a campaign tactic to brag he did this.

3. At the behest of DNC party leadership to protect their members against not insignificant parts of their base which are angry by having one less thing Dem votes are on record for in terms of supporting it. This gains more credence if the plan actually is to ditch him at the convention and bring out someone else though that seems unlikely this close to the finish.

If Congress can be bypassed, then the congressional path only exists for show: for lending further legitimacy and/or spreading/shifting accountability.

Good point, at least we didn't have to see AOC shed crocodile tears this time.