Debugger stuck when write to IO

[newptcai]

I have the following function which I tried to debug

"""
    encode_file_to_base64(file_path)

Encodes the content of a file to a Base64 string along with its MIME type.

# Arguments
- `file_path`: Path to the file to be encoded.

# Returns
A tuple containing the MIME type and the Base64-encoded string.

"""
function encode_file_to_base64(file_path)
    @debug "Encoding $file_path to Base64"

    # Read the file content
    file_content = read(file_path)

    @debug "File content read: $(length(file_content)) bytes"

    # Determine the MIME type based on file extension
    file_extension = splitext(file_path)[2]
    mime_type = mime_from_extension(file_extension)

    @debug "MIME type: $mime_type"

    # Create a base64-encoded string
    io = IOBuffer()
    iob64_encode = Base64EncodePipe(io)
    write(iob64_encode, file_content)
    close(iob64_encode)
    base64_encoded = String(take!(io))

    @debug "Base64 encoded: $(length(base64_encoded)) bytes"

    return (mime_type, base64_encoded)
end

When debugger reaches the line write(iob64_encode, file_content) and I hit u, the debugger never reaches the next line.

Running the code without debugger does not get stuck there.