Filebeats 7.5.0 issue with s3 input with gzip files

[Ronin]

I have verified that the following issue works under 7.4.2 correctly.

If a file is a gzip file it can not be decombressed under 7.5.0. The following log messages are provided:

ERROR [s3] s3/input.go:259 handleS3Objects failed: newS3BucketReader failed: Failed to decompress gzipped file s3file.txt.gz: gzip: invalid header
panic: send on closed channel

goroutine 121 [running]:

github.com/elastic/beats/x-pack/filebeat/input/s3.(*s3Input).processMessage(0xc0000db340, 0x34b5c20, 0xc000484190, 0x0, 0xc0009d0250, 0xc0009d02d0, 0x0, 0x0, 0xc0009d0300, 0xc0009d0330, ...)

/go/src/github.com/elastic/beats/x-pack/filebeat/input/s3/input.go:260 +0x2f6

created by github.com/elastic/beats/x-pack/filebeat/input/s3.(*s3Input).processor

/go/src/github.com/elastic/beats/x-pack/filebeat/input/s3/input.go:240 +0x19c

[Ronin]

Looks like this may be related to https://github.com/elastic/beats/pull/13980, but this says gzip support was added for 7.5.0, however we were using gzip in 7.4.2 without any issue.