Unfortunately, with regards to this conflict, the reason why other Arab nations aren't welcoming in Palestinians with open arms is the dirty little secret that most won't say out loud, but that most historians of the region know is true... the surrounding Arab nations dislike the Palestinians almost as much as the Israelis do, due to past conflicts and dealings with them.
They'll throw stones (figuratively and literally) at Israel for their handling of the situation, but at the same time, whenever it's been pitched in the past to put the territories under the control of one of the Arab nations in the region, they all do the "who us?!? Uh, we're really busy with other stuff, so we can't"
Kuwait and other Gulf states expelled a half a million Palestinians in the 90's
Lebanon expelled close to 125,000 Palestinians in the 80's
Egypt destroyed the Gaza-Sanai tunnel system, and has closed the Rafa border crossing no less than a dozen times between 2010 and present day
Palestinians have had their beefs with Syria on multiple occasions
The Saudis have cracked down on any group affiliated with the Muslim Brotherhood
Palestinian groups, especially the PLO and later Hamas, have often acted independently, sometimes clashing with their Arab hosts or challenging their authority:
- Jordan (Black September, 1970) – The PLO operated as a state within a state, leading to a crackdown by King Hussein.
- Lebanon (1970s–1980s) – Palestinian militants were seen as destabilizing Lebanon’s fragile sectarian balance, contributing to the civil war.
- Kuwait (1990–91 Gulf War) – Palestinians aligned with Saddam Hussein, leading to their expulsion after Iraq’s defeat.
They've gotten a reputation as being "difficult" and "troublemakers" due to the fact that wherever they've been, they seem to have a track record of organizing and rebelling against their host country.
To put it more bluntly, the other Arab states have basically said "Nah, we've dealt with them before, we don't need that kind of drama"
So, while the aspect of "the reason why they're rebelling and acting out is because they don't want to be occupied by a Israel" is a popular talking point to deflect and place blame on Israelis, their behavior has been somewhat similar even when they're residing in other Muslim countries for which they have zero claim to the land.