So long as any decree entered pursuant to the provisions of section 4301 (relating to appointment of temporary fiduciary) remains in force, the fiduciary named therein shall exercise none of his fiduciary powers or discretion and shall be under no liability for any acts or omissions of the substituted fiduciary pro tem or of any cofiduciary or cofiduciaries during that period: Provided, That nothing contained in this chapter shall relieve a fiduciary from liability for the administration of the estate before the entry of a decree under the provisions of section 4301 and upon the reinstatement of such fiduciary.