Eagle import: Schematic error when opening imported schematic

Description

The first time an imported schematic is opened, the following error appears:

An error was found when loading the schematic that has been automatically fixed. Please save the schematic to repair the broken file or it may not be usable with other versions of KiCad.

Steps to reproduce

1. Import the Eagle project contained in the attached Zip file.
2. Save the resulting KiCad schematic.
3. Close the schematic.
4. Reopen the schematic.
5. Observe the error dialog box.

KiCad Version

Application: KiCad Schematic Editor

Version: 6.0.4-6f826c9f35~116~ubuntu20.04.1, release build

Libraries:
	wxWidgets 3.0.4
	libcurl/7.68.0 OpenSSL/1.1.1f zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.21.0 (+libidn2/2.2.0) libssh/0.9.3/openssl/zlib nghttp2/1.40.0 librtmp/2.3

Platform: Linux 5.4.0-100-generic x86_64, 64 bit, Little endian, wxGTK, KDE, x11

Build Info:
	Date: Mar 21 2022 17:21:29
	wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24
	Boost: 1.71.0
	OCC: 7.5.2
	Curl: 7.81.0
	ngspice: 31
	Compiler: GCC 9.4.0 with C++ ABI 1013

Build settings:
	KICAD_USE_OCC=ON
	KICAD_SPICE=ON

EagleImportFrame.zip