A bill has been introduced to override the IRS on this (providing they don't voluntarily yield to public and Congressional pressure to reverse themselves).

S. 3612
To clarify for purposes of the Internal Revenue Code of 1986 that receipt of coronavirus assistance does not affect the tax treatment of ordinary business expenses.

IN THE SENATE OF THE UNITED STATES
May 5, 2020
Mr. Cornyn (for himself, Mr. Grassley, Mr. Wyden, Mr. Rubio, and Mr. Carper) introduced the following bill; which was read twice and referred to the Committee on Finance

A BILL
To clarify for purposes of the Internal Revenue Code of 1986 that receipt of coronavirus assistance does not affect the tax treatment of ordinary business expenses.
Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled,

SECTION 1. SHORT TITLE.
This Act may be cited as the “Small Business Expense Protection Act of 2020”.
SEC. 2. CLARIFICATION OF TREATMENT OF BUSINESS EXPENSES.
(a) In General.—Subsection (i) of section 1106 of the CARES Act (Public Law 116–136) is amended—
(1) by striking “1986, any amount” and inserting “1986—
“(1) any amount”,
(2) by striking the period at the end and inserting “, and”, and
(3) by adding at the end the following new paragraph:
“(2) no deduction shall be denied or reduced, no tax attribute shall be reduced, and no basis increase shall be denied, by reason of the exclusion from gross income provided by paragraph (1).”.
(b) Effective Date.—The amendments made by this section shall apply as if included in the enactment of section 1106 of the CARES Act (Public Law 116–136).

https://www.congress.gov/116/bills/s3612/BILLS-116s3612is.xml