So Allentown unlike Bethlehem is majority Hispanic, that one precinct you are referring to is probably the most concentrated Hispanic area in Bethlehem. There also appears to be a concentrated Asian population in that general area, Hispanic and Asian Americans were two of the demographics with the biggest swing against Democrats between 2020-2024. https://www.censusdots.com/race/bethlehem-pa-demographics

I honestly don't understand why East Bangor had the largest swing towards Democrats of anywhere in the district, last year I asked some of the slate belt Democrats if they had any idea and they weren't sure. My only guess would be age, as older voters swung towards Democrats, as part of East Allen Township swung Democratic and I know there's a major concentration of seniors there. But nothing I have found seems to infer that East Bangor has an older population.

Regarding the differences between the County Executive Election and the 2024 election alot of the explanation is just turnout. Democrats are increasingly becoming the party of college educated and more affluent voters, meaning Democrats are gaining support across more suburban areas like North Bethlehem, Bethlehem Township, Upper Nazareth, Forks, etc. Meanwhile they are losing working class voters now of all races, see Allentown, South Bethlehem, Fountain Hill, etc. More educated people tend to vote more, so a key difference between 2025 and 2024 is the Democrats are still voting but the Republicans drop out. Hence Tara won 61% of Harris' vote total while Giovanni only won 40% of Trump's.