Can't download file. Project 474008

Default endpoint /_files/download/ - render file, but response type is Download
I created custom bp with custom endpoint. Bytes in response, but download didn’t start. File exists. Permissions for site are granted for download files, all browser extensions are off. If I try to download file with “Download from ULR” on frontend - there is a problem:

Screen

image

File exists
File ID is in custom model, in DB all stored properly