import bpy
from pathlib import Path

file_path = Path("collection_bug.blend")
bpy.ops.wm.open_mainfile(filepath=str(file_path.resolve()))

for obj in bpy.data.objects:
    obj.hide_render = True

print(bpy.app.version_string)

print("Iteration 1:")
for obj in bpy.data.collections["Collection 1"].all_objects:
    print(obj)

print("\n\nIteration 2:")
for obj in bpy.data.collections["Collection 1"].all_objects:
    print(obj)
    obj.hide_render = False