Use a locally built RPM instead of directly modifying it.

sdata/dist-fedora/SPECS/breeze-plus.spec

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+Name:           breeze-plus
+Version:        6.19.0
+Release:        %autorelease
+Summary:        Breeze theme with additional icons
+
+License:        LGPL-2.1
+URL:            https://github.com/mjkim0727/breeze-plus
+Source0:        %{name}-%{version}.tar.gz
+
+BuildArch:      noarch
+
+%description
+Breeze icon theme with additional icons for applications not covered by the
+official Breeze theme. Includes icons for Wine, third-party apps, and more.
+
+%prep
+wget --content-disposition -q -N -P %{_sourcedir} %{url}/archive/refs/tags/%{version}.tar.gz
+%setup -q
+
+%build
+:
+
+%install
+install -d -m 0755 %{buildroot}%{_iconsdir}/breeze-plus
+cp -r src/breeze-plus %{buildroot}%{_iconsdir}/
+cp -r src/breeze-plus-dark %{buildroot}%{_iconsdir}/
+
+install -d -m 0755 %{buildroot}%{_licensedir}/%{name}
+install -m 0644 LICENSE %{buildroot}%{_licensedir}/%{name}/
+
+%files
+%{_iconsdir}/breeze-plus/
+%{_iconsdir}/breeze-plus-dark/
+%license %{_licensedir}/%{name}/LICENSE
+
+%changelog
+%autochangelog
+